U.S. patent application number 10/213148 was filed with the patent office on 2003-07-31 for electrodeless lighting system.
Invention is credited to Choi, Joon-sik, Jeon, Hyo-sik, Jeon, Yong-Seog, Kim, Hyun-Jung, Lee, Ji-Young, Park, Byeong-Ju.
Application Number | 20030141828 10/213148 |
Document ID | / |
Family ID | 27615778 |
Filed Date | 2003-07-31 |
United States Patent
Application |
20030141828 |
Kind Code |
A1 |
Choi, Joon-sik ; et
al. |
July 31, 2003 |
Electrodeless lighting system
Abstract
In an electrodeless lighting system having a cooling unit for
cooling a radiator therein, the electrodeless lighting system
includes a microwave generating unit for generating microwave
energy; a light emitting unit connected to the microwave generating
unit and emitting light by forming plasma by the microwave energy
generated in the microwave generating unit; a housing having a
first receiving space for receiving the microwave generating unit
and sealed-combined with the light emitting unit; a heat exchanger
installed at the outer surface of the microwave generating unit to
absorb heat generated in the microwave generating unit; a radiator
installed at the outer surface of the housing; and a heat transfer
member at which one end is connected to the heat exchanger and the
other end is connected to the radiator by penetrating the housing
to transmit heat from the heat exchanger to the radiator.
Inventors: |
Choi, Joon-sik; (Seoul,
KR) ; Jeon, Yong-Seog; (Gwangmyeong, KR) ;
Jeon, Hyo-sik; (Gwangmyeong, KR) ; Kim,
Hyun-Jung; (Seoul, KR) ; Lee, Ji-Young;
(Gwangmyeong, KR) ; Park, Byeong-Ju; (Seoul,
KR) |
Correspondence
Address: |
BIRCH STEWART KOLASCH & BIRCH
PO BOX 747
FALLS CHURCH
VA
22040-0747
US
|
Family ID: |
27615778 |
Appl. No.: |
10/213148 |
Filed: |
August 7, 2002 |
Current U.S.
Class: |
315/248 ;
315/291 |
Current CPC
Class: |
H01J 65/044 20130101;
H01J 61/52 20130101 |
Class at
Publication: |
315/248 ;
315/291 |
International
Class: |
H01J 007/24 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 25, 2002 |
KR |
04554/2002 |
Jan 25, 2002 |
KR |
04555/2002 |
Claims
What is claimed is:
1. An electrodeless lighting system, comprising: a microwave
generating unit for generating microwave energy; a light emitting
unit connected to the microwave generating unit and emitting light
by forming plasma by the microwave energy generated in the
microwave generating unit; a housing having a first receiving space
for receiving the microwave generating unit and sealed-combined
with the light emitting unit; a heat exchanger installed at the
outer surface of the microwave generating unit to absorb heat
generated in the microwave generating unit; a radiator installed at
the outer surface of the housing; and a heat transfer member at
which one end is connected to the heat exchanger and the other end
is connected to the radiator by penetrating the housing to transmit
heat from the heat exchanger to the radiator.
2. The system of claim 1, further comprising: a waveguide received
in a second receiving space of the housing and transmitting
microwave energy from the microwave generating unit to the light
emitting unit.
3. The system of claim 2, wherein a heat insulating wall is formed
at the internal or the outer surface of the waveguide.
4. The system of claim 2, wherein a heat insulating wall is formed
at the internal and the outer surfaces of the waveguide.
5. The system of claim 1, wherein the light emitting unit includes:
a resonator cutting off microwave energy and passing light; and a
bulb filled with materials forming plasma by microwave energy.
6. The system of claim 1, wherein the heat exchanger and the heat
transfer member are formed as one body.
7. The system of claim 1, wherein the microwave generating unit is
a magnetron.
8. The system of claim 7, wherein the heat exchanger is a coil
wound around the outer surface of an anode body of the
magnetron.
9. The system of claim 1, wherein the heat transfer member is a
heat pipe.
10. The system of claim 1, wherein the heat transfer member is a
thermoelectric device.
11. The system of claim 1, wherein the first receiving space has a
heat insulating wall to insulate other units inside the housing
from heat generated in the microwave generating unit.
12. The system of claim 11, wherein the first receiving space is
sealed by the heat insulating wall, the heat insulating wall has an
opening formed for connecting an output of the microwave generating
unit to the light emitting unit and a hole formed for an electric
wire to apply power to the microwave generating unit.
13. The system of claim 11, wherein the heat insulating wall is
formed as one body with the housing.
14. The system of claim 11, wherein the heat insulating wall is
received in the housing and formed as one body with the waveguide
transmitting microwave energy from the microwave generating unit to
the light emitting unit.
15. The system of claim 1, wherein the radiator is fixedly
installed at the outer surface of the housing by a fixing member so
as to have a certain distance from the housing.
16. The system of claim 15, wherein the fixing member has a heat
insulating characteristic.
17. The system of claim 1, wherein a heat insulating member is
interposed between the radiator and the outer surface of the
housing, and the radiator is fixedly installed at the outer surface
of the housing.
18. The system of claim 1, wherein the radiator consists of plural
radiating pins combined with the heat transfer member.
19. The system of claim 1, wherein the section of the heat transfer
member has a quadrilateral shape.
20. The system of claim 1, further comprising: a fan housing having
an air inlet hole for air inflow, an air discharge hole for
discharging air and an air path connected to the air inlet hole and
the air discharge hole and fixedly installed at the outer surface
of the housing; a fan installed in the air path to generate air
flow in the air path; wherein the radiator is installed in the air
path.
21. The system of claim 20, wherein the fan housing is combined
with the housing by a connecting means with a distance from the
housing.
22. The system of claim 20, wherein the air path is formed so as to
surround the outer surface of the housing.
23. The system of claim 1, further comprising: the power supply
unit received in a third receiving space formed inside the housing
to apply power to the microwave generating unit.
24. The system of claim 23, further comprising: a heat exchanger
installed at the outer surface of the power unit to absorb heat
generated in the power unit; and a heat transfer member at which
one end is connected to the heat exchanger and the other end is
connected to the radiator by penetrating the housing to transmit
heat from the heat exchanger to the radiator.
25. The system of claim 23, further comprising: a fan housing
having an air inlet hole for air inflow, an air discharge hole for
discharging air and an air path connected to the air inlet hole and
the air discharge hole and fixedly installed at the outer surface
of the housing; a fan installed in the air path to generate air
flow in the air path; wherein the radiator is installed in the air
path.
26. The system of claim 25, wherein the fan housing is combined
with the housing by a connecting means with a distance from the
housing.
27. The system of claim 25, wherein the air path is formed so as to
surround the outer surface of the housing.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to an electrodeless lighting
system, and in particular to an electrodeless lighting system
having a cooling unit capable of cooling a radiating unit
therein.
[0003] 2. Description of the Prior Art
[0004] An electrodeless lighting system generates light by forming
plasma by exciting light emitting materials charged inside a bulb
as a vacuum state with microwave energy.
[0005] FIG. 1 is a schematic longitudinal sectional view
illustrating a construction of the conventional electrodeless
lighting system.
[0006] As depicted in FIG. 1, the conventional electrodeless
lighting system includes a microwave generating unit 10 installed
inside a housing 50 and generating microwave energy; a power supply
unit 40 applying power to the microwave generating unit 10; a
waveguide 20 connected to the microwave generating unit 10 and
transmitting the microwave energy generated in the microwave
generating unit 10; a light emitting unit 30 forming plasma 20 and
generating light by being excited by the microwave energy
transmitted through the waveguide 20; and a cooling fan 60
installed at a certain side of the housing 50 and cooling the
microwave generating unit 10 and the power supply unit 40.
[0007] The light emitting unit 30 includes a bulb 31 in which light
emitting materials are charged, a waveguide 20, a resonator 32
covering the front of the bulb 31 to cut off microwave energy and
pass light generated in the bulb 31, a reflecting mirror 33
receiving the resonator 32 and intensely reflecting light generated
in the bulb 31 straight and a dielectric mirror 34 passing
microwave energy and reflecting light.
[0008] In the housing 50, a cooling fan 60 is received, an air
suction hole 61 is formed at the lower portion corresponding to the
cooling fan 60, an air path 62 is formed at the right and left
portions of the air suction hole 61, and an air outlet 63 is formed
at the upper portion of the housing 50 so as to correspond to the
both ends of the air path 62.
[0009] The microwave generating unit 10 and the power supply unit
40 are placed between the air path 62 and the air outlet 63 and are
respectively combined to the both sides of the waveguide 20.
[0010] A non-explained reference numeral 35 is an axial portion, M1
is a bulb motor rotating the bulb 31, and M2 is a fan motor
rotating the cooling fan 60.
[0011] The operation of the conventional electrodeless lighting
system will be described in more detail.
[0012] According to an operation signal from a control unit (not
shown), the power supply unit 40 supplies power to the microwave
generating unit 10, and the microwave generating unit 10 generates
microwave energy having a high frequency.
[0013] While the microwave energy generated in the microwave
generating unit 10 is transmitted into the resonator 32 through the
waveguide 20, the light emitting materials charged inside the bulb
31 are excited and form plasma, and accordingly light is generated.
The generated light lights the surroundings by being reflected by
the reflecting mirror 33 and the dielectric mirror 34 toward the
front.
[0014] In the meantime, while the electrodeless lighting system
operates, lots of heat occurs in the microwave generating unit 10
and the power supply unit 40, etc., in particular, in the microwave
generating unit 10 such as a magnetron, part of high frequency
energy generated by thermal electron is not discharged but
converted into heat, and accordingly an internal temperature of the
housing 50 rises.
[0015] And, heat generated in the microwave generating unit 10 and
the power supply unit 40, etc. may damage the internal units of the
electrodeless lighting system such as the magnetron and the power
supply unit 40 or cause unstableness of the system.
[0016] Accordingly, there is a need to cool the heat generated in
the microwave generating unit 10 and the power supply unit 40,
etc., as depicted in FIG. 1, in the conventional electrodeless
lighting system, to cool heat generated in the microwave generating
unit 10, etc. outer air flows into the housing 50 by operating the
cooling fan 60.
[0017] However, in the conventional electrodeless lighting system,
because outer air flows into the housing 50 by operating the
cooling fan 60, impurities may penetrate into the housing 50, and
accordingly the internal units may be damaged. Particularly, when
the electrodeless lighting system is installed at the exterior,
rain drops or other impurities may penetrate into the housing 50,
and accordingly various parts may be damaged.
SUMMARY OF THE INVENTION
[0018] In order to solve the above-mentioned problems, it is an
object of the present invention to provide an electrodeless
lighting system having a cooling unit capable of being installed in
a housing and efficiently cooling a microwave generating unit
sealed in the housing.
[0019] In order to achieve the above-mentioned object, an
electrodeless lighting system in accordance with the present
invention includes a microwave generating unit for generating
microwave energy; a light emitting unit connected to the microwave
generating unit and emitting light by forming plasma by the
microwave energy generated in the microwave generating unit; a
housing having a first receiving space for receiving the microwave
generating unit and sealed-combined with the light emitting unit; a
heat exchanger installed at the outer surface of the microwave
generating unit to absorb heat generated in the microwave
generating unit; a radiator installed at the outer surface of the
housing; and a heat transfer member at which one end is connected
to the heat exchanger and the other end is connected to the
radiator by penetrating the housing to transmit heat from the heat
exchanger to the radiator.
[0020] The system further includes a fan housing having an air
inlet hole for air inflow, an air discharge hole for discharging
air and an air path connected to the air inlet hole and the air
discharge hole and fixedly installed at the outer surface of the
housing; and a fan installed in the air path to generate air flow
in the air path; wherein the radiator is installed in the air
path.
BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The accompanying drawings, which are included to provide a
further understanding of the invention and are incorporated in and
constitute a part of this specification, illustrate embodiments of
the invention and together with the description serve to explain
the principles of the invention.
[0022] In the drawings:
[0023] FIG. 1 is a longitudinal sectional view illustrating a
construction of the conventional electrodeless lighting system;
[0024] FIG. 2 is a longitudinal sectional view illustrating an
electrodeless lighting system in accordance with an embodiment of
the present invention;
[0025] FIG. 3 is a longitudinal sectional view illustrating a
housing of the electrodeless lighting system in FIG. 2;
[0026] FIG. 4 is a partial longitudinal-sectional view illustrating
a magnetron, which is connected to a waveguide by a coaxial cable,
of the electrodeless lighting system in FIG. 3;
[0027] FIG. 5 is a partial transverse-sectional view illustrating a
radiator, which is installed to a housing after interposing a heat
insulating member between them, of the electrodeless lighting
system in FIG. 3;
[0028] FIG. 6 is a partial longitudinal-sectional view illustrating
a construction of a waveguide of the electrodeless lighting system
in FIG. 3;
[0029] FIG. 7 is a partial longitudinal-sectional view illustrating
a power supply unit, at which a heat transfer member is connected,
of the electrodeless lighting system in FIG. 3;
[0030] FIG. 8 is a partial expanded view illustrating a fan
assembly additionally installed at the electrodeless lighting
system in FIG. 2; and
[0031] FIG. 9 is a partial expanded view illustrating another fan
assembly additionally installed at the electrodeless lighting
system in FIG. 2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0032] Hereinafter, an electrodeless lighting system in accordance
with the present invention will be described in detail with
reference to accompanying FIGS. 2.about.7.
[0033] As depicted in FIG. 2, the electrodeless lighting system in
accordance with the present invention includes a magnetron 100 as a
microwave generating unit for generating microwave energy; a light
emitting unit 300 connected to the magnetron 100 and emitting light
by forming plasma according to the microwave energy generated in
the magnetron 100; a housing 500 having a magnetron receiving space
110 for receiving the magnetron 100 and sealed-combined with the
light emitting unit 300; a heat exchanger 710 installed at the
outer surface of the magnetron 100 to absorb heat generated in the
magnetron 100; a radiator 720 installed at the outer surface of the
housing 500; and a heat transfer member 730 at which one end is
connected to the heat exchanger 710 and the other end is connected
to the radiator 720 by penetrating the housing 500 to transmit heat
from the heat exchanger 710 to the radiator 720.
[0034] The light emitting unit 300 includes a bulb 310 in which
light emitting materials are charged, a waveguide 200, a resonator
320 covering the front of the bulb 310 to cut off microwave energy
and pass light generated in the bulb 310, a reflecting mirror 330
receiving the resonator 320 and intensely reflecting light
generated in the bulb 310 straight and a dielectric mirror 340
passing microwave and reflecting light.
[0035] The light emitting unit 300 is connected to the magnetron
100 by the waveguide 200 transmitting microwave energy generated in
the magnetron 100 to the light emitting unit 300.
[0036] As depicted in FIGS. 2 and 3, the housing 500 is made of a
material having a high heat conductivity, an opening 210 of the
waveguide 200 assembled with the light emitting unit 300 is formed
at the front surface, and a hole 731 is formed at the rear surface
to pass and connect the heat transfer member 730 with the radiator
720.
[0037] In the housing 500, a receiving space is formed to receive
internal units such as the magnetron, etc., it is sealed by
combining with the light emitting unit 300. In addition, to
separately receive the magnetron 100 from other internal units, a
heat insulating wall 510 is formed to divide the receiving space
into a magnetron receiving space 110 and an other units receiving
space 120.
[0038] In order to receive a part of the waveguide 200 with the
magnetron 100 inside the magnetron receiving space 110, the heat
insulating wall 510 can be fabricated as a plate member (not shown)
covering the middle portion of the waveguide 200, or it can be
fabricated as one body with the waveguide 200 and be combined with
the housing 500.
[0039] As depicted in FIG. 2, the heat insulating wall 510 can be
formed in one body with the housing 500. In addition, the heat
insulating wall 510 may have a through hole 220 for an outlet 130
of the waveguide 200, and a hole (not shown) for an electric wire
to apply power to the microwave generating unit.
[0040] Herein, the housing 500 and the heat insulating wall 510 can
be fabricated as a simple molding method or an insert molding
method according to materials thereof.
[0041] As depicted in FIG. 4, the heat insulating wall 510 can be
placed between the waveguide 200 and the magnetron 200, in that
case, assembly can be performed after fabricating the heat
insulating wall 510 separately, or the heat insulating wall 510 can
be fabricated at a certain side surface of the waveguide 200 as one
body.
[0042] The other internal units receiving space 120 receives the
power supply unit 400 and a bulb motor (M1) combined with an axial
portion 350 of the bulb 310 to rotate the bulb 310.
[0043] The heat exchanger 710, the radiator 720 and the heat
transfer member 730 construct one cooling system, cooling system
can be variously formed such as a heat pipe and thermoelectric
element, etc. according to cooling types, in case of needs, a heat
exchanger and a heat transfer member can be fabricated as one body
such as a heat pipe and thermoelectric element.
[0044] In the electrodeless lighting system in accordance with the
present invention, as a heat pipe consisting of the heat exchanger
710 and the heat transfer member 730 as one body, the heat
exchanger 710 has a cylindrical or rectangular, etc. shaped
section, the end of the heat exchanger 710 is wound around and
combined with the outer circumference of an anode cylinder (not
shown) as a light emitting portion of the magnetron 100 by a
welding or a thermal bond in order to make an internal working
fluid convert its phase according to a temperature of the anode
cylinder.
[0045] Herein, it is preferable to add a heat transfer material
such as grease or paste, etc. at contact surfaces of the heat
exchanger 710 and the magnetron 100 in order to improve a light
emitting efficiency of the magnetron 100.
[0046] The heat transfer member 730 constructed as one body with
the heat exchanger 710 passes the hole 731 formed at the housing
500 and is combined with the radiator 720 by a welding or a thermal
bond. Herein, as depicted in FIG. 2, it is preferable to fill up a
space between the hole 731 and the heat transfer member 730 with
sealing member (S) such as silicon, etc., or seal-combine them by a
welding in order to prevent penetration of rain drops or
impurities.
[0047] The heat transfer member 730 can connect the heat exchanger
710 and the radiator 720 by using a block type member made of
aluminum or copper having a good heat conductivity besides the heat
pipe. The heat transfer member 730 can have various section shapes
such as a circular or a rectangular shape.
[0048] As depicted in FIG. 2, the radiator 720 consists of plural
cooling pins fabricated as a thin plate shape having a good heat
conductivity and combined with the heat transfer member 730.
Herein, the plural cooling pins are fixedly combined with the
housing 500 by a connecting bracket 721 with a certain distance
from the outer surface of the housing 500, or a plate-shaped
cooling plate (not shown) having a certain thickness and width made
with a material having a good heat conductivity can be fabricated
and fixedly combined with the housing 500 by the connecting bracket
721.
[0049] The connecting bracket 721 for combining the radiator 720
with the housing 500 uses a heat insulating member in order not to
transmit heat to the housing 500.
[0050] In the meantime, as depicted in FIG. 5, on behalf of the
connecting bracket 721, a heat insulating member 722 can be
inserted between the housing 500 and the radiator 720 and be
combined with the housing 500.
[0051] In the waveguide 200 fabricated as a ring shape at which a
hollow portion is formed at its central portion, an inlet 242 is
formed so as to connect to the outlet of the magnetron 100, a bulb
side hole 243 is formed at the upper portion so as to pass through
an axial portion 350 of the bulb 310, and a ring-shaped outlet 244
is formed at the circumference of the bulb side hole 243 so as to
connect with the resonator 320.
[0052] As depicted in FIG. 6, it is preferable to form a heat
insulating layer 245 at the inner and outer surfaces of the
waveguide 200 to prevent heat generated in lighting of the bulb 310
from back-flowing through the outlet 244 of the waveguide 200 and
radiating inside the housing 500 through each wall surface.
[0053] The outlet 130 of the magnetron 100 can be directly
connected to the inlet 242 of the waveguide 200. In case of needs,
as depicted in FIG. 4, the outlet 130 of the magnetron 100 can be
connected to the inlet 242 of the waveguide 200 by using an
additional coaxial cable 140. In that case, because a position of
the magnetron 100 can be freely changed, designing of the heat
insulating wall 510 can be facilitated.
[0054] In the meantime, as depicted in FIG. 2 or 7, the power
supply unit 400 for applying power to the internal units such as
the magnetron 400, etc. can be installed inside the housing
500.
[0055] Particularly, as depicted in FIG. 2 or 7, in the power
supply unit 400, in order to radiate heat generated in the power
supply unit 400, a heat exchanger (not shown) and the heat transfer
member 420 are installed at the outer surface of the power supply
unit 400. A heat pipe or a heat transfer rod made of copper or
aluminum can be used as the heat transfer member 420. The heat
transfer member 420 passes through the housing 500 and connects the
power supply unit 400 with the radiator 720, and accordingly heat
can be radiated outside of the housing 500.
[0056] In the meantime, in the electrodeless lighting system in
accordance with the present invention, in order to make the
radiator 720 radiate heat more efficiently, a fan assembly for
generating air flow around the radiator 720 can be additionally
installed.
[0057] FIG. 8 is a partial expanded view illustrating a fan
assembly additionally installed at the electrodeless lighting
system in FIG. 2, and FIG. 9 is a partial expanded view
illustrating another fan assembly additionally installed at the
electrodeless lighting system in FIG. 2.
[0058] As depicted in FIG. 8, the fan assembly includes an air
inlet hole 821 for air inflow; an air discharge hole 822 for
discharging air; a fan housing 820 having an air path (not shown)
connecting the air inlet hole 821 and the air discharge hole 822;
and a fan 810 installed inside the air path to generate air
flow.
[0059] The fan housing 820 is fixedly combined with the housing 500
by a connecting member 825, etc. Herein, the radiator 720 is placed
in the air path. The radiator 720 can be fabricated as FIG. 2 or 5.
In FIG. 8, the radiator 720 in FIG. 5 is used.
[0060] In addition, as depicted in FIG. 9, the fan housing 820 can
be fixedly installed at the housing 500 by a fixing member 826 so
as to make the air path cover part of the housing 500.
[0061] In the fan housing 820, the fan 810 and a fan motor (M2) for
rotating the fan 810 are installed, as depicted in FIGS. 8 and 9,
the fan 810 can use an axial fan to facilitate a channel design of
the fan housing 820 or a centrifugal fan to reduce a noise even it
has a relatively complicated channel shape.
[0062] The operation and advantages of the electrodeless lighting
system in accordance with the present invention will be described
in more detail.
[0063] According to an operation signal of the control unit (not
shown), the power supply unit 400 operates the magnetron 100, and
the magnetron 100 generates microwave energy.
[0064] The microwave energy generated in the magnetron 100 is
transmitted to the resonator 300 through the waveguide 200 and
excites materials enclosed in the bulb 310 to form plasma, light is
generated by the plasma, and accordingly the light illuminates a
space while being reflected toward the front by the reflecting
mirror 330 and the dielectric mirror 340.
[0065] Herein, lots of heat occurs in the magnetron 100, the heat
is discharged while being transmitted to the radiator 720 installed
at the outer surface of the housing 500 through the heat pipe or
the heat exchanger 710 and the heat transfer member 730 made of
aluminum or copper, and accordingly the magnetron 100 is
cooled.
[0066] In addition, in the power supply unit 400, high heat occurs
in boosting and supplying power to the magnetron 100, the heat is
transmitted to the radiator 720 through the heat exchanger (not
shown) and the heat transfer member 420 installed at the outer
surface of the power supply unit 400 and connected to the radiator
720 and is discharged.
[0067] In addition, in the bulb 310, besides visible rays infrared
rays occur, the infrared rays are radiated by convection while
being rotated by the bulb motor (M1), however, part of the infrared
rays may back-flow into the waveguide 200 and radiate into the
housing 500, in order to prevent it, the heat insulating layer 245
is formed at the inner and outer surfaces of the waveguide 200, and
accordingly it is possible to prevent efficiently the heat of the
bulb 310 from transmitting to the housing 500.
[0068] In addition, by dividing the internal space of the housing
500 into the magnetron receiving space 110 and other internal units
receiving part 120 by the heat insulating wall 510, it is possible
to prevent high heat generated in the magnetron 100 from
transmitting to other internal units.
[0069] In addition, because the heat insulating wall 510 is made of
heat insulating materials, it is possible to prevent relatively
high heat generated in the magnetron 100 from transmitting to other
internal units, and accordingly overheat of the power supply unit
400 or the bulb motor (M1) can be prevented.
[0070] In addition, by fixedly combining the radiator 720 with the
housing 500 by using the connecting bracket 721 made of heat
insulating materials with a distance from the outer surface of the
housing 500 or by interposing the heat insulating member 722
between the housing 500 and the radiator 720 and tightly combining
them, it is possible to prevent heat generated in the magnetron 100
or the power supply unit 400 and transmitted to the radiator 720
from back-flowing into the housing 500, and accordingly
error-operation or damage of the internal parts of the housing 500
due to heat can be prevented.
[0071] In particular, in the conventional electrodeless lighting
system, when it is placed at the exterior, internal units of a
housing may be damaged due to penetration of rain drops or
impurities. However, in the electrodeless lighting system in
accordance with the present invention, by separately receiving a
magnetron by dividing internal space of the housing, winding a heat
transfer member such as a heat pipe around the outer circumference
of the magnetron and connecting the end of the heat transfer member
to a cooling pins substrate or a cooling plate placed at the
outside of the housing, heat generated in the magnetron can be
efficiently radiated. In addition, by sealing the housing,
penetration of rain drops or impurities into the housing can be
efficiently prevented.
[0072] As the present invention may be embodied in several forms
without departing from the spirit or essential characteristics
thereof, it should also be understood that the above-described
embodiments are not limited by any of the details of the foregoing
description, unless otherwise specified, but rather should be
construed broadly within its spirit and scope as defined in the
appended claims, and therefore all changes and modifications that
fall within the metes and bounds of the claims, or equivalence of
such metes and bounds are therefore intended to be embraced by the
appended claims.
* * * * *